AN INTERVARIETAL MOLECULAR MARKER MAP IN TRITICUM-AESTIVUM L EM THELLAND COMPARISON WITH A MAP FROM A WIDE CROSS

An intervarietal molecular marker map covering most of the nuclear gen ome was developed in Triticum aestivum. One hundred and six androgenet ic-derived doubled haploid lines obtained from the F-1 between monosom ics of 'Chinese Spring' and 'Courtot' were analysed for genetic mappin g. The map covered 18 of the 21 chromosomes with an identical distribu tion of markers in the A and B genome, and only small segments of the D genome. Distorted markers were mapped using Bailey's 2-point method and revealed skewed regions on 1A, 1DS, 2A, 2B, 4AS and 6B. Comparison with a wide cross ['Opata' x Synthetic hexaploid (T. tauschii/'Altar 84')] showed colinearity for markers on homologous chromosomes, but re vealed a large proportion (25%) of markers mapped on non-homoeologous chromosomes, i.e. heterologous markers. The origin of the material and distortion segregation are discussed with particular emphasis on inve stigations of D-genome markers.